How do I make a serial/key system?

Question

I would like to make a serial/key system for my program so the user has to enter their serial/key to get the program updated. How would I do so? I am horrible with databases. :\ Thanks alot! :D

Answer 1

See this question, and other questions linked from there such as this one. Most are asked by people using other languages, but answers deal with abstract concepts that apply to any language. Note that this is not an easy problem to solve anyway, and a solution can only be "good enough", never perfect.